新颖的单级三相电压型准Z源光伏并网逆变器

发布时间：2018-01-13 11:04

本文关键词：新颖的单级三相电压型准Z源光伏并网逆变器　出处：《中国电机工程学报》2017年07期 　论文类型：期刊论文

【摘要】：提出了一种新颖的强升压能力的单级三相电压型准Z源光伏(photovoltaic,PV)并网逆变器,并对这种逆变器的电路拓扑、改进的空间矢量脉宽调制(space vector pulse width modulation,SVPWM)控制策略和低频工作模式、高频开关过程、外特性等稳态原理特性进行了深入研究,获得了重要结论和电压传输比表达式。该电路拓扑是由大升压比准Z源阻抗网络、三相逆变桥和三相LCL滤波器构成,该改进的SVPWM控制策略为大升压比阻抗网络储能电容电压控制和光伏电池最大功率跟踪(maximum power point tracking,MPPT)外环并网电流内环控制。实验结果验证了采用改进SVPWM控制策略的准Z源逆变器的实际性能。所提出的准Z源逆变器为实现低输入电压或宽变化范围输入电压的新能源并网发电提供了一种有效方法。
[Abstract]:A novel single-stage three-phase three-phase quasi-Z-source photovoltaicPVV grid-connected inverter with strong boost capacity is proposed, and the circuit topology of this inverter is also discussed. Improved space vector pulse width modulation (SVPWM) control strategy and low frequency operation mode for space vector pulse width modulation. The steady-state characteristics such as high-frequency switching process and external characteristics are deeply studied and the important conclusions and expressions of voltage transfer ratio are obtained. The circuit topology is based on a large boost ratio quasi-Z source impedance network. Three-phase inverter bridge and three-phase LCL filter. The improved SVPWM control strategies are capacitive voltage control for energy storage and maximum power tracking for photovoltaic cells with large boost ratio impedance network. Maximum power point tracking. MPPT). The practical performance of the quasi-Z-source inverter with improved SVPWM control strategy is verified by the experimental results. The proposed quasi-Z-source inverter is used to realize low input voltage or wide range input. The voltage of the new energy grid power generation provides an effective method.
【作者单位】：福建省新能源发电与电能变换重点实验室(福州大学);
【分类号】：TM46
【正文快照】： 0引言传统的电压型和电流型PWM逆变器电路结构简洁,易于控制,但存在如下缺陷[1-3]:1)电压型/电流型逆变器为降压型/升压型逆变器,当直流母线电压低于/高于输出交流电压时,需要增加一级升压变换器/降压变换器来实现电压匹配;2)电压型逆变器同一桥臂的上下功率开关需要设置死区

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